Consider consolidating base redis install and config into common

[JedMeister]

I have not yet had a close look at this, so perhaps it might not make as much sense as it seems from a casual perspective. But I think that it might be a good idea for there to be a common makefile &/or plan for redis (in common)?!

I note that there are a number of appliances that now ship with redis:

• canvas
• faveo-helpdesk
• mayan-edms
• nextcloud
• owncloud
• redis
• ushahidi

And perhaps foodsoft soon too?! (see #1565)